如果你想表达某人对你来说很重要，你可以使用以下几个英语短语来表达这个意思：

"You are important to me." (你对我很重要。)
"You mean a lot to me." (你对我来说很重要。)
"You are significant to me." (你对我很重要。)
"You are valuable to me." (你对我很重要。)

希望这些短语能帮到你！